Electromagnetic drive for secondary clocks or the like.



A. 0 12311301111. ELECTROMAGNETIC DRIVE FOR SECONDARY CLOCKS OR THE LIKE.

APPLICATION FILED JUNE 7, 1911. RENEWED NOV. 23, 1912.

1,070,577, Patented Aug. 19, 1913.

3 SHEETS-SHEET 1.

INVENTOR ,1

4 TTOR/VEY A. O. BENBGKE. ELECTROMAGNETIC DRIVE FOR SECONDARY CLOCKS OR THE LIKE.

APPLICATION FILED JUNE 7, 1911. RENEWED NOV. 23, 1912.

1,070,577, Patented Aug.19,l913.

3 SHBET8-SHEET 2.

WITNESSES:

A. O. BBNEOKE.

ELECTROMAGNETIC DRIVE FOR SECONDARY CLOCKS OR THE LIKE.

APPLICATION FILED JUNE 7, 1911. RENEWED 11017.23, 1912.

1,070,577, Patented Aug. 19, 1913.

8 SHEETS-SHEET 3.

I I o WITNESSES: IN l/EN TOR ZIEE/ZZE/W a A TTOH/VEY UNITED STATES PATENT OFFICE.

ADELBERT O. BENECKE, OF FOXBORO, MASSACHUSETTS.

ELECTROMAGNETIC DRIVE FOR SECONDARY CLOCKS OR THE LIKE.

Application filed June-7, 1911, Serial No. 631,815.

To all whom it may concern Be it known that I, ADELBERT O. BnNEoKE, a citizen of the United States, residing at Foxboro, in the county of Norfolk and State of Massachusetts, have invented certain new and useful Improvements in Electromagnetic Drives for Secondary Clocks or the Like, of which the following is a full, clear,

and eXact description, such as will enable others skilled in the art to which'it pertains to make, construct, and use the same, reference being had to the accompanying drawings, and to letters of reference marked thereon, forming a part of this specification.

My invention relates to electro-magnetic drives for secondary clocks or the like, in which an electro-magnet attracts an armature, the armature transmitting its motion to a lever, which by means of a pivoted pawl,

turns a ratchet wheel attached to the shaft of the minute hand.- Intermediate wheels are employed for transmitting the motion from the minute-hand shaft to the hour hand, as is common inclocks of the type referred to. It is obvious that the regularity of the motion of the hands depends upon the regularity, of the oscillations of the armature and its attached parts, therefore, the

oscillations of the current before passing into the electro-magnet are regulated by a standard clock, which itself has been previously regulated by a seconds pendulum. At each oscillation of the pendulum, there is an arrangement by which it opens and closes the current, and thus the armature beats seconds exactly.

I-Ieretofore, in the construction. of secondary clocks of the type to which my invention relates, it has been customary to attach to the armature of an electro-magnct, an arm provided with a pawl, which pawl engaged with the teethof a ratchet wheel, so arranged that when the armature of the magnet is attracted, the pawl slides backward over one tooth of the ratchet wheel, and

- has been found very objectionable, inasmuch as not only the armature with its attached arm, has to move, but it has to carry with it, the pivoted pawl, which has to move independently around its pivot. This arrange- Specification of Letters Patent.

' PatentedAug.19,1913.

Renewed November 23, 1912. Serial No. 733,181.

ment has been found to introduce a great deal of friction, seriously interfering with the accuracy of the indications of the clock. This can readily be understood byconsiderng what would happen in case the energizing circuit is closed for a short period of time, and the indicating mechanism should fail to operate for the reason that the pawl' had not sufiicient time to fall into its proper position.

My invention has for its object, to provide an electro-magnetic drive for secondary clocks and the like, which is not open to the objections above referred to, and I accomplish my object by so arranging stationary pins upon the electro-magnetically operated arm which is attached to the armature of the electromagnet, that when the arm is attracted, said stationary pins will engage with the teeth arranged on the peripheral surfaces of the wheels in order to impart motion thereto.

A preferred construction of a secondary clock embodying my invention, is shown in the accompanying drawings, in which Figure 1 represents a side elevation of a secondary clock movement embodying my invention. Fig. 2 represents a front elevation of the same, the movement-supporting bracket being removed to show the mechanism. Fig. 3 represents a front view of the electro-magneti'cally operated arm and ratchet wheels. Fig. 4 represents a side view of the same." Figs. 5 and 6 represent front views of the ratchet wheels shown in Fig. 4:. Figs. 7 and 8 represent front and side views of a modified form of electromagnetically operated arm and ratchet wheels; and Figs. 9 and 10 represent front views of the ratchet wheels shown in Fig. 7.

Similar letters of reference refer' to like parts throughout the specification and drawin s.

lily improved drive, (Fig. 3) comprises an eleetro-magnetically' operated arm a, pivoted at a, which is attached to the armature b of the electro-magnet c in any convenient manner, said arm being provided at its upper forked end with the stationary pins (2 and 6, designed to engage with the teeth of the ratchet wheels f and g respectively, the teeth of the respective ratchet wheels facing in opposite directions, as clearly illustrated in Fig. 3, so that a practically continuous rotary movement will be imparted to the wheels in opposite directions, when" the arm a is moved back and forth. It will be readily seen that when the armature b is attracted, the pin 6 will engage with the slanting surfaces of one of the teeth of the ratchet wheels f and g, which are loosely mounted on the shaft h, and that the pin 6 will move the wheels f and 9 around in the direction indicated by the arrows, to the extent of half.

a tooth, and that when the arm a is retracted by the spring 2', the pin 03 will engage with the slanting surfaces of one of the opposecondary clocks in which one electro-magnet will operate the arm a, and impart to the two Wheels f and g, motion in opposite directions, thereby afiording means for using two dial faces on opposite sides of the clock, in which case, one wheel operates the mechanism attached to one face of the clock, and the other wheel will operate the mechanism attached to the other face of the clock.

In Figs. 7 and 8 of the drawings, I have shown a modification of my invention, the

arrangement of which is also designed to drive the-wheels j and 7c in opposite directions, and in which the electro-magnetically operated pivoted arm Z is provided with four stationary pins, lettered m, n, 0 and g) respectively, arranged on both sides of the arm as clearly illustrated in Fig. 8, said stationary pins being so arranged that they ush against the radial or back surfaces 0 the teeth of the respective ratchet wheels, in order to impart motion in opposite directions to the same, as indicated by the arrows, as distinguished from the arrangement shown in Figs. 3 and 4, in which case, the stationary pins (Z ande enga e with the slanting surfaces of the teeth 0 the ratchet wheels f and g respectively.

In Figs. 1 and 2 of the drawings, I have illustrated a double-faced secondary clock movement embodying the principles of my invention, in which a represents the driving arm attached to the armature b of the electro-magnet c. d, d and e, 6 respectively, are

the stationary driving pins, carried by the arm a, and so arranged as to engage with the radial or back surfaces of the teeth of, the ratchet wheels f and g, which are attached to the shafts of the minute hand of said .clock, there being one minute hand shaft for each face, in any suitable manner, in order to impart motion in opposite directions to the same. 9 and r, and g and 1* are intermediate wheels for transmitting motion from the minute shaft to the hour shaft, and i represents the spring which returns the arm a and the armature b, to which it is attached when the current passing through the magnet is broken.

Experience has demonstrated that the organization above described, is a highly efficient one, and while the device described is the preferred embodiment of my present invention, I do not care to restrict myself to the exact details of construction, combination, and arrangement herein-set forth, it being obvious that minor variations thereof not involvi g the exercise of invention may be made by any skilled mechanic, and such departures from what is herein described and claimed not involving invention, I consider as within the scope and terms of my claims.

I claim:

1. In combination withthe cooperating elements of secondary clocks and the like of the character described, drive wheels having teeth arranged on their peirpheral surfaces and in opposite directions, a pivoted arm electro-magnetically operated, said arm provided with engaging elements, which engage with the teeth of said wheels, in order'to impart motion thereto.

2. In combination with the cooperating elements of secondary clocks and the like of the character described, drive wheels having slanting teeth arranged on their peripheral surfaces and in opposite directions, a pivoted arm electro-magnetically operated, said arm provided with stationary engaging elements, which engage with the slanting surfaces of the teeth of said wheels in order to impart motion thereto.

This specification signed and witnessed 105 

